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MB 845 MK 2 Super Amplifier
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL HEALTH &
SAFETY INFORMATION FOR
YOU AND YOUR AMPLIFIER.
PLEASE READ & KEEP SAFE
AND REFER TO IF NECESSARY
1 Introduction & Final Inspection
Thank you for purchasing the
. These pure valve mono block
MK II
amplifiers are the result of years of careful design
and listening tests with a wide range of speakers.
The amplifiers are hand built using carefully selected
audiophile components. The transformers are hand
wound using low oxygen copper and special
Japanese long grain iron. Finally each amplifier is
valved, carefully commissioned and tweaked for
best performance in Leicester UK.
In order to get the best out of your amplifier, please
read the "SET UP" notes. These contain important
information about the correct operation and safety.
Should you be uncertain about anything please
contact your dealer or one of our team.
Valve amplifiers do need a little more attention than
their solid-state counterparts, but the sonic results
are well worth it. In this manual we have tried to
include everything that you need to know. Please let
*See engineers notes at rear
icon Audio
Instruction Manual Covering:
Shown with upgraded driver valves
Contents
1 Introduction
us know if you find any errors or feel that we have
MB 845
missed anything out.
The
amplifiers using the fabulous 845 high power triode
valves. These have very special characteristics
which many people consider give the finest
reproduction of any valves. Similar to the 300B but
with more power and punch. These are in fixed-bias
mode which gives maximum power, cool running
and low distortion. You MUST occasionally check
the bias (at least twice a year). The driver and phase
splitting are also triode for best sound quality and
low noise. The MB 845s are sensitive enough to be
used with any pre-amplifier or passive in most
situations. . Their simplicity coupled with point to
point hand wiring without the use of printed circuit
boards results in an open euphoric sound that is
wonderfully detailed and warm.
8 Specifications
are push-pull all triode power
MB 845
Page 1
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Summary of Contents for icon Audio MB 845 MK 2
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Page 1: Table Of Contents
Audio Instruction Manual Covering: MB 845 MK 2 Super Amplifier IMPORTANT! THIS MANUAL CONTAINS ESSENTIAL HEALTH & SAFETY INFORMATION FOR YOU AND YOUR AMPLIFIER. Shown with upgraded driver valves PLEASE READ & KEEP SAFE Contents AND REFER TO IF NECESSARY 6 Bias Adjustment 1 Introduction &... - Page 2 Final Inspection - Your Guarantee of Quality To assure you of optimum performance and reliability, this amplifier has passed our rigorous final inspection and listening test by the Icon Audio team in Leicester during which the final set up and adjustments were made.
- Page 3 MB845 MK II Layout and Features If you are inserting the 845 valve for the first time, it may be helpful to observe the slot in the valve base to indicate the degree of rotation needed to fit the valve correctly. *See engineers notes at rear Page 3...
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Page 4: Quick Set Up Guide
‘Trouble Shooting’ section or contact Icon Audio. 1 Unpack each unit carefully. Make sure that it is in good condition. If not report to Icon Audio or 6a Sensitivity Switch your dealer. It is important that you keep the Located on the rear, this switch is “UP”... -
Page 5: Connecting Inputs & Outputs
This could either be achieved by either a ‘inside out’ with reduced bass. If you are unable “passive” or powered unit. Icon Audio makes ideal to check this or confirm the polarity (e.g. if you pre amps. You may wish to consult your dealer. If have ‘built in’... -
Page 6: Trouble Shooting
A symptom of this would be no 0.4V bias voltage at the test point. Also the valve would not be as hot as the others. Refer to an engineer or to Icon Audio. Spare internal fuses are secured inside the chassis. -
Page 7: Bias Adjustment
If you are unable to set the reading high enough this means the emission of the valve is low. Icon Audio can test the valve for you, or ideally a matched pair or single valve be substituted*. -
Page 8: Valve Replacement
In the case of output valves this will result in not damage, buy will reduce the amplifier performance). being able to set the bias. Icon Audio is happy to check the valves/amp or re- 2, The valve gets noisy/microphonic. Usually happens bias your amp free of charge. -
Page 9: Guarantee
Thank you for purchasing one of our amplifiers. We guarantee becomes void if the unit has been hope you will be pleased with it. modified in any way not approved by Icon Audio. 10 Packing Instructions This amplifier is guaranteed by the dealer you... - Page 10 Engineers Notes These notes are only intended for use by an engineer qualified to work with high voltage triodes like the 845/805. Owners should refer any problems to a dealer or service agent. The amplifier may be inverted by supporting the transformers on non abrasive surface (e.g.